And if you're looking for other countries, you can amend these URLs by changing the 'GB' or 'US' to whatever country code iTunes uses for the relevant country site - FR for France, DE for Germany, NL for The Netherlands, AU for Australia, NZ for New Zealand and so on. This assumes that iTunes has a store for the particular country you're interested in (otherwise it launches iTunes and defaults to the US store, I think).

Well, it was a discovery for me anyway. And not everything is available in every store, as I've found out. But at least I've learned something new today.